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"We went to a lineout and Brodie Retallick made the call. I went up to him and said 'what's that play?' He said 'you know the one' … it was a special play that involved me, and one we'd been practising all week.

"Apparently I said to him I don't know it, talk me through it. At that point he knew I wasn't quite right and was no good to him or the team and was also putting myself at risk by carrying on playing. He let the physio know and they pulled me off then and there.

"Who knows, if I'd played on however long and taken another bang … two knocks in one game is seriously not good. I'm thankful Brodie did what he did."

Cane says he believes real courage on the rugby field is admitting that you or your teammate has been affected by concussion or a head knock.

"As rugby players we all like to try to tough things out," he told Stuff. "A lot of guys would be first to throw their body on the line for their team, but it takes real courage to put your hand up and say you're not quite right this week, or suffering headaches or nausea from a blow you've taken.

"It's courageous for your own wellbeing but you're also no good to your teammates if you're not at 100 per cent.